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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Effects of quasi-stationary large-scale anomalies on some mesoscale features associated with the 1993 flood: A regional model simulation
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Effects of quasi-stationary large-scale anomalies on some mesoscale features associated with the 1993 flood: A regional model simulation

机译：准平稳的大尺度异常对某些与1993年洪水有关的中尺度特征的影响：区域模型模拟

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摘要

We investigate the effect of quasi-stationary large-scale anomalies on mesoscale factors contributing to the 1993 U.S. Midwest flood by performing 30-day simulations with a mesoscale model. The contributions of anomalous mesoscale features to the flood were quantified by contrasting model integrations forced by initial and lateral boundary conditions with and without large-scale anomalous stationary waves that are believed to have been responsible for the flood. Supplementing previous investigations, the present study finds the following: (1) The large-scale anomalies produced environmental conditions that favored a generation of MCC-like systems rather than individual convective cells or squall lines that would have produced less precipitation over large areas. Ambient conditions favoring mesoscale convective complex (MCC) include an intensified east-west orientation of quasistationary fronts, weaker upper tropospheric inertial stability, and a strong low-level jet (LLJ). (2) The anomalous ageostrophic wind component to the far south of the flood region (Texas area) and geostrophic wind component over the flood region bridged together to form an extended moisture conveyer that sustained the long-lasting 1993 flood. [References: 22]
机译：我们通过执行30天的中尺度模型模拟研究准静止大尺度异常对造成1993年美国中西部洪水的中尺度因子的影响。中尺度异常特征对洪水的贡献通过对比模型的积分来量化，该模型积分是由初始边界条件和横向边界条件所强加的，而有和没有大范围的异常平稳波被认为是造成洪水的原因。作为对先前研究的补充，本研究发现以下内容：（1）大规模异常产生的环境条件有利于一代MCC样系统的产生，而不是单个对流单元或or流线，后者会在大范围内产生较少的降水。有利于中尺度对流复合体（MCC）的环境条件包括准静止锋的东西向方向增强，对流层上层惯性稳定性较弱以及低空急流（LLJ）。 （2）洪水区最南端的异常营养风分量（得克萨斯地区）与洪水区上空的地转风分量桥接在一起，形成了一个扩展的水分输送带，从而持续了1993年的洪水。 [参考：22]

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